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383 info

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by NoSmog73, Dec 22, 2001.

  1. NoSmog73

    NoSmog73 1/2 ton status

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    Ok here goes my ? is this what is involved with making a 383 from the 350 other than the 400 crank and the .030 pistons I was thinking to buy the kit from paw and have someone do the install of the kit but what is required to get the 383 also what would be a good cam to put in with the kit,and would the holley pro-jection work ok with the 383. Just looking for some opions get my tax return sone and want to play.
     
  2. michaelm

    michaelm 1/2 ton status

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    400 cranks dont fit in 350 blocks, different mains
    then you need to think what pistons/rods are you going to use
    350 pistons can work if you run 400 rods,
    if you want to run 350 rods special pistons are required.
    if you have good heads the long rod stuff is BS so either way will work and the aftermarket is all over this combo so parts are cheap and not custom one off anymore.
     
  3. zakk

    zakk 1/2 ton status

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    my ideal engine combo v. 383

    4 bolt pre-86 350 bored over .030
    some crank kit (everyone seems to have one)
    S/R torquer heads 1.94's
    9:1 compression
    5.7" rods
    TPI with burnt chip
    268 hi energy comp cam
    chrome dipsstick[​IMG]

    a holley projection won't work. it is only made for >275HP motors. if your 383 makes that you shouldn't be building it IMHO. plus even IF the HP number is that low, the torque you would be producing starve w/ those injectors.

    -zakk

    '77 1-Ton K5

    [​IMG] CK5's MOAB 2002 OR BUST!! [​IMG]
     
  4. zakk

    zakk 1/2 ton status

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    <blockquote><font class="small">In reply to:</font><hr>

    if you have good heads the long rod stuff is BS...

    <hr></blockquote>

    please elaborate on this...if your are building for torque, like most of us are, long rods are conducive to broad, flat torque cruves, much like my dream of a 6" rod 406. Heads only help what you have built on the bottom end IMHO

    -zakk

    '77 1-Ton K5

    [​IMG] CK5's MOAB 2002 OR BUST!! [​IMG]
     
  5. TX Mudder

    TX Mudder 1/2 ton status

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    The 383 swings wider and will need to be clearance on the oil pan rails, esp. #7 and #8.
    Also your connecting rods will probably hit the camshaft. You can either buy a reduced circle camshaft or clreanance your rods or buy special rods made for this purpose.
    You can use a 400 crank bby hading the journals ground from 2.65 to 2.45. A better option is to buy a kit that has a new cast crank and pistons with the correct relief for your CR.
    I haven't built mine yet, but it's coming. :)
    -- Mike

    <font color=blue> Married to a woman who understands the need for <font color=orange>Hugger Orange. [​IMG] <font color=blue>
     
  6. DesertDueler

    DesertDueler 1/2 ton status

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    Yes the small base cam is very important. We ran into that problem not to long ago. The first one we did had no problems, but the second one did and it wouldnt allow the motor to turn over.

    86Jimmy 4"&35"MTRs,87 burb 4"&33"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. HarryH3

    HarryH3 1 ton status Author

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    <blockquote><font class="small">In reply to:</font><hr>

    400 cranks dont fit in 350 blocks, different mains

    <hr></blockquote>

    But a bit of time in the machine shop and the 400 crank will drop right into a 350 block. I've got one sitting out in the driveway that was built about 10 years ago using this method. But 383 small blocks have since become so popular that now you can buy brand new stroker cranks that are already made to drop right into the 350. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  8. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Good kits are available from ECONO 383

    "MIGHTY MOUSE"

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s - 36" TSLs
     
  9. michaelm

    michaelm 1/2 ton status

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    finally someone answers the origonal query
     
  10. NoSmog73

    NoSmog73 1/2 ton status

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    thanks to all that responded. When the my tax return comes in There will be the 383 or a 454 in the 350's place soon I hope thanks-mike
     

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